INA190A2IDDFR - 40V Bidirectional Current Sense Amp | TI
Teilenummer: INA190A2IDDFR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $2.1 | $2,10 |
| 10 | $1.89 | $18,90 |
| 100 | $1.58 | $158,00 |
| 500 | $1.25 | $625,00 |
| 1.000 | $0.95 | $950,00 |
| 3.000 | $0.78 | $2.340,00 |
INA190A2IDDFR Übersicht
A current-sense amplifier is an analog building block that converts a small differential voltage developed across a shunt resistor into a ground-referenced output voltage proportional to load current. The INA190 family belongs to the current-sense amplifier / instrumentation amplifier / signal-chain IC / analog IC taxonomy, sitting one level below general-purpose op-amps because it integrates a precision gain network and reference-stable input stage optimized for high common-mode rejection at high voltages. This category plays a central role in modern power management, where system optimization, telemetry, and closed-loop feedback demand accurate, low-latency current data.
Key features include a 1.8-V to 5.5-V supply range, 65 uA typical quiescent current, 60 V common-mode transient immunity, and 40 kHz small-signal bandwidth. Output swings rail-to-rail and the device supports low-side, high-side, and bidirectional topologies, eliminating external protection circuitry in 12-V, 24-V, and 48-V industrial buses. The picoamp input bias current allows sense resistors up to tens of kilo-ohms, which is critical for monitoring sleep-mode current in battery-powered products without degrading accuracy.
The zero-drift chopper architecture continuously nulls 1/f noise and thermal drift, yielding effectively DC-stable output over the full -40C to +125C operating range. The internal EN pin lets a microcontroller gate the supply current down to a sub-microamp leakage level, which is essential for always-on battery systems that must periodically wake to perform current sampling. Combined, these characteristics make the INA190A2 one of the lowest-noise, lowest-drift current-sense amplifiers in its class.
Typical applications include USB-PD and Type-C cable-compensation, motor-control current loops, solar MPPT input monitors, battery-pack gas-gauging, and point-of-load telemetry in servers and telecom rectifiers. The fixed 50 V/V gain optimizes the part for low-current (sub-amp) measurements where the A1 (25 V/V) is too noisy and the A3 (100 V/V) or A4 (200 V/V) variants sacrifice dynamic range.
A key design consideration is the trade-off between shunt resistance and dissipated power: choose a 50 V/V part when the load is typically below 1 A and milliohm shunts are preferred, and place the input capacitor network as close as possible to the IN+ and IN- pins to reject high-frequency transients on the common-mode bus.
This page synthesizes distributor pricing, drop-in alternatives in the same TSOT-23-8 footprint, and practical design notes that go beyond the manufacturer datasheet to help engineers select, source, and qualify the INA190A2IDDFR for their next precision current-monitoring design.
Drop-in-Alternativen für INA190A2IDDFR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
INA190A1IDDFR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
INA190A3IDDFR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
INA190A4IDDFR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
INA180A2IDDFR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
INA181A2IDDFR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
INA190A2IDDFR Grenzwerte & elektrische Eigenschaften
| Product Type | Current Sense Amplifier |
| Gain (V/V) | 50 V/V (A2 option) |
| Common-Mode Input Range | -0.2 V to +40 V |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Ruhestrom | 65 uA (typical) |
| Input Offset Voltage | 5 uV (typ), 15 uV (max) |
| Input Offset Drift | 0.1 uV/C (max) |
| Input Bias Current | picoamp range |
| Small-Signal Bandwidth | 40 kHz |
| Common-Mode Rejection Ratio | 132 dB (DC) |
| Betriebstemperaturbereich | -40C to +125C |
| Gehäuse | TSOT-23-8 (DDF), 2.9 mm x 1.6 mm |
| Enable-Pin | Yes (active-high) |
| Topology Support | Low-side, high-side, bidirectional |
| RoHS-Status | Compliant |
| MSL-Level | 1 (260C, unlimited floor life) |
INA190A2IDDFR Pin-Konfiguration
| Pin 1 | IN- — Inverting input from low-side of shunt resistor |
| Pin 2 | IN+ — Non-inverting input from high-side of shunt resistor |
| Pin 3 | GND — Ground reference |
| Pin 4 | EN — Enable input, active-high |
| Pin 5 | REF — Reference voltage input for bidirectional offset |
| Pin 6 | OUT — Amplified output voltage |
| Pin 7 | VS — Supply voltage (1.8 V to 5.5 V) |
| Pin 8 | EP — Exposed thermal pad, tie to GND |
Typische Anwendungen
INA190A2IDDFR ist geeignet für 6 Anwendungs: USB-PD and Type-C Cable Current Monitoring, Motor Control Current-Loop Feedback, Battery-Pack Gas Gauging and Coulomb Counting, Solar MPPT Input Current Sensing, Point-of-Load Server/Telecom Current Telemetry, Power-Over-Ethernet Powered Device Current Monitor.
USB-PD and Type-C Cable Current Monitoring
The INA190A2IDDFR is well suited to USB-PD and Type-C cable-compensation loops because its 40 V common-mode range exceeds the 20 V USB-PD extended-power range and its 50 V/V transimpedance produces a usable 0-3 V output for sub-amp load currents typical of cable IR-drop compensation. Placed between the source/bulk capacitor and the load, the part monitors current on the VBUS line, allowing the PD controller to dynamically adjust its output voltage to compensate for cable losses. The 65 uA quiescent current keeps efficiency loss below 0.1% even at 100 mA standby, and the EN pin lets the controller gate the amplifier off entirely during sleep. Compared to discrete op-amp + sense-resistor solutions, the integrated zero-drift chopper removes the manual calibration step required at production test.
Empfohlen
Motor Control Current-Loop Feedback
In FOC and trapezoidal BLDC/PMSM motor drives, the INA190A2IDDFR's picoamp input bias and 0.1 uV/C offset drift allow accurate phase-current measurement with milliohm shunts, which keeps power dissipation low in 24-V and 48-V industrial drives. The fixed 50 V/V gain and 40 kHz bandwidth comfortably cover PWM chopping frequencies up to 20 kHz, which is the typical range for 3-phase inverter carriers. The 132 dB DC CMRR rejects switching noise on the high-side bus, so the amplifier can sit on the high-side of the half-bridge with no extra filtering. Designers should add a small RC network (1 kohm + 100 nF) on each input to suppress the dv/dt transients of the bridge switching events.
Empfohlen
Battery-Pack Gas Gauging and Coulomb Counting
The INA190A2IDDFR's picoamp input bias current is the critical enabler for accurate coulomb counting in multi-cell battery packs because it allows milliohm and sub-milliohm sense resistors without bias-induced error dominating the measurement. With a 1 milliohm shunt and 50 V/V gain, the part resolves 1 mA of load current as 50 uV at the output, well within the 5 uV typical offset. Placed on the high-side of the pack, the 40 V common-mode rating supports 2- to 12-series Li-ion configurations up to 50.4 V fully charged. The EN pin lets the BMS gate the amplifier off during shipment/storage, extending shelf charge by months versus always-on solutions.
Empfohlen
Solar MPPT Input Current Sensing
In photovoltaic MPPT controllers, the INA190A2IDDFR's 40 V common-mode range comfortably handles 12-V, 24-V, and 48-V solar panel Voc including cold-temperature over-voltage transients. The 50 V/V gain converts sub-amp panel currents into a 0-2.5 V signal at the A2 reference, which the MPPT controller can sample with a low-resolution SAR ADC. The zero-drift architecture keeps offset drift below 0.1 uV/C across the -40C to +85C outdoor range, eliminating the periodic re-calibration required by conventional current-sense amplifiers. The low 65 uA quiescent current adds less than 0.01% to the always-on monitoring loss budget.
Empfohlen
Point-of-Load Server/Telecom Current Telemetry
In 12-V and 48-V point-of-load converters for servers and telecom rectifiers, the INA190A2IDDFR provides accurate, low-latency current telemetry to the system controller for dynamic load balancing and fault detection. The 40 kHz bandwidth is sufficient to capture transient response during load steps in the microsecond-to-millisecond range, and the rail-to-rail output swings make direct connection to a 3.3-V ADC straightforward without level shifting. Placing the amplifier on the high-side of the POL output allows detection of short-to-ground faults on the load side, an important feature in hot-swap architectures. The EN pin can be tied to the PGOOD line of the upstream converter to gate monitoring only when the rail is valid.
Empfohlen
Power-Over-Ethernet Powered Device Current Monitor
The INA190A2IDDFR's -0.2 V to +40 V common-mode input range covers the full PoE/PoE+ range including the -48 V supply of legacy 802.3af systems and the 50 V extended-power of 802.3at/at+. Placed on the high-side after the PD controller's hot-swap FET, it monitors the load current drawn by the downstream Ethernet PHY and processor, providing fault protection and telemetry back to the system MCU. The 65 uA quiescent current keeps the always-on loss under 5 mW at 48 V, well within the 802.3 standby budget. Compared to discrete solutions, the integrated zero-drift chopper eliminates the need for periodic in-field recalibration typical of low-cost op-amp implementations.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für INA190A2IDDFR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | INA190A1IDDFR | INA190A3IDDFR | INA190A4IDDFR | INA180A2IDDFR | INA181A2IDDFR |
|---|---|---|---|---|---|---|
| Package | TSOT-23-8 (DDF) | TSOT-23-8 (DDF) - same | TSOT-23-8 (DDF) - same | TSOT-23-8 (DDF) - same | TSOT-23-8 (DDF) - same | TSOT-23-8 (DDF) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain (V/V) | 50 V/V (A2) | 25 V/V (A1) | 100 V/V (A3) | 200 V/V (A4) | 50 V/V (A2) | 50 V/V (A2) |
| Common-Mode Range | -0.2 V to +40 V | -0.2 V to +40 V | -0.2 V to +40 V | -0.2 V to +40 V | -0.2 V to +26 V | -0.2 V to +26 V |
| ENABLE Pin | Yes | Yes | Yes | Yes | No | No |
| Quiescent Current (typ) | 65 uA | 65 uA | 65 uA | 65 uA | 115 uA | 130 uA |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Wichtigste Unterscheidungsmerkmale
- Picoamp input bias current enables microamp-range measurements with large shunts (vs. INA180A2IDDFR)
- Zero-drift chopper architecture for sub-uV offset drift (vs. INA180A2IDDFR)
- Integrated ENABLE pin for sub-uA sleep current (vs. INA180A2IDDFR)
Designhinweise
Estimated (input bias current ~50 pA, 1 Mohm equivalent input impedance) - input bias current of picoamps means the sense resistor can be tens of kilo-ohms, but do not exceed the absolute maximum differential input voltage of +/- 40 V across the shunt during fault events. Add 1 kohm input resistors on IN+ and IN- to limit inrush during hot-plug, which can otherwise exceed the absolute maximum ratings and permanently damage the input stage.
Route the IN+ and IN- traces as a differential pair directly from the sense resistor Kelvin connections, keeping the trace length under 5 mm and avoiding vias on either input. Place the REF-pin decoupling capacitor (typically 100 nF) as close to the REF pin as possible to filter high-frequency noise on the reference, which directly appears as output noise in bidirectional applications.
The TSOT-23-8 package exposed thermal pad is internally bonded to GND - tie it to the system ground plane with at least 3 thermal vias in a 3x1 grid pattern. This stabilizes the die temperature, which directly reduces chopper-induced ripple at the output. For applications sampling the output with a SAR ADC, add an external RC filter (10 kohm + 100 nF, fc = 160 Hz) on the output to remove the 40 kHz chopper ripple.
Compliance-Informationen
RoHS compliant and lead-free per TI product page. MSL Level 1 per JEDEC J-STD-020 (260C reflow, unlimited floor life). For AEC-Q100 qualified version, choose INA190A2IDDFRQ1 (suffix -Q1).
